optic activity

op·ti·c ac·tiv·i·ty

the ability of a compound in solution (possessing no plane of symmetry, usually because of the presence of one or more asymmetric carbon atoms) to rotate the plane of polarized light.

op·ti·c ac·tiv·i·ty

(op'tik ak-tiv'i-tē) The ability of a compound in solution (one possessing no plane of symmetry, usually because of the presence of one or more asymmetric carbon atoms) to rotate the plane of polarized light.